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/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License version 2.
*/
#ifndef LOCK_DLM_DOT_H
#define LOCK_DLM_DOT_H
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/socket.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/kobject.h>
#include <linux/fcntl.h>
#include <linux/wait.h>
#include <net/sock.h>
#include <linux/dlm.h>
#include "../../lm_interface.h"
/*
* Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
* prefix of lock_dlm_ gets awkward. Externally, GFS refers to this module
* as "lock_dlm".
*/
#define GDLM_STRNAME_BYTES 24
#define GDLM_LVB_SIZE 32
#define GDLM_DROP_COUNT 50000
#define GDLM_DROP_PERIOD 60
#define GDLM_NAME_LEN 128
/* GFS uses 12 bytes to identify a resource (32 bit type + 64 bit number).
We sprintf these numbers into a 24 byte string of hex values to make them
human-readable (to make debugging simpler.) */
struct gdlm_strname {
unsigned char name[GDLM_STRNAME_BYTES];
unsigned short namelen;
};
enum {
DFL_BLOCK_LOCKS = 0,
DFL_SPECTATOR = 1,
DFL_WITHDRAW = 2,
};
struct gdlm_ls {
uint32_t id;
int jid;
int first;
int first_done;
unsigned long flags;
struct kobject kobj;
char clustername[GDLM_NAME_LEN];
char fsname[GDLM_NAME_LEN];
int fsflags;
dlm_lockspace_t *dlm_lockspace;
lm_callback_t fscb;
lm_fsdata_t *fsdata;
int recover_jid;
int recover_jid_done;
int recover_jid_status;
spinlock_t async_lock;
struct list_head complete;
struct list_head blocking;
struct list_head delayed;
struct list_head submit;
struct list_head all_locks;
uint32_t all_locks_count;
wait_queue_head_t wait_control;
struct task_struct *thread1;
struct task_struct *thread2;
wait_queue_head_t thread_wait;
unsigned long drop_time;
int drop_locks_count;
int drop_locks_period;
};
enum {
LFL_NOBLOCK = 0,
LFL_NOCACHE = 1,
LFL_DLM_UNLOCK = 2,
LFL_DLM_CANCEL = 3,
LFL_SYNC_LVB = 4,
LFL_FORCE_PROMOTE = 5,
LFL_REREQUEST = 6,
LFL_ACTIVE = 7,
LFL_INLOCK = 8,
LFL_CANCEL = 9,
LFL_NOBAST = 10,
LFL_HEADQUE = 11,
LFL_UNLOCK_DELETE = 12,
};
struct gdlm_lock {
struct gdlm_ls *ls;
struct lm_lockname lockname;
char *lvb;
struct dlm_lksb lksb;
int16_t cur;
int16_t req;
int16_t prev_req;
uint32_t lkf; /* dlm flags DLM_LKF_ */
unsigned long flags; /* lock_dlm flags LFL_ */
int bast_mode; /* protected by async_lock */
struct completion ast_wait;
struct list_head clist; /* complete */
struct list_head blist; /* blocking */
struct list_head delay_list; /* delayed */
struct list_head all_list; /* all locks for the fs */
struct gdlm_lock *hold_null; /* NL lock for hold_lvb */
};
#define gdlm_assert(assertion, fmt, args...) \
do { \
if (unlikely(!(assertion))) { \
printk(KERN_EMERG "lock_dlm: fatal assertion failed \"%s\"\n" \
"lock_dlm: " fmt "\n", \
#assertion, ##args); \
BUG(); \
} \
} while (0)
#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "\n" , ## arg)
#define log_info(fmt, arg...) log_print(KERN_INFO , fmt , ## arg)
#define log_error(fmt, arg...) log_print(KERN_ERR , fmt , ## arg)
#ifdef LOCK_DLM_LOG_DEBUG
#define log_debug(fmt, arg...) log_print(KERN_DEBUG , fmt , ## arg)
#else
#define log_debug(fmt, arg...)
#endif
/* sysfs.c */
int gdlm_sysfs_init(void);
void gdlm_sysfs_exit(void);
int gdlm_kobject_setup(struct gdlm_ls *, struct kobject *);
void gdlm_kobject_release(struct gdlm_ls *);
/* thread.c */
int gdlm_init_threads(struct gdlm_ls *);
void gdlm_release_threads(struct gdlm_ls *);
/* lock.c */
int16_t gdlm_make_lmstate(int16_t);
void gdlm_queue_delayed(struct gdlm_lock *);
void gdlm_submit_delayed(struct gdlm_ls *);
int gdlm_release_all_locks(struct gdlm_ls *);
void gdlm_delete_lp(struct gdlm_lock *);
unsigned int gdlm_do_lock(struct gdlm_lock *);
int gdlm_get_lock(lm_lockspace_t *, struct lm_lockname *, lm_lock_t **);
void gdlm_put_lock(lm_lock_t *);
unsigned int gdlm_lock(lm_lock_t *, unsigned int, unsigned int, unsigned int);
unsigned int gdlm_unlock(lm_lock_t *, unsigned int);
void gdlm_cancel(lm_lock_t *);
int gdlm_hold_lvb(lm_lock_t *, char **);
void gdlm_unhold_lvb(lm_lock_t *, char *);
void gdlm_sync_lvb(lm_lock_t *, char *);
/* plock.c */
int gdlm_plock_init(void);
void gdlm_plock_exit(void);
int gdlm_plock(lm_lockspace_t *, struct lm_lockname *, struct file *, int,
struct file_lock *);
int gdlm_plock_get(lm_lockspace_t *, struct lm_lockname *, struct file *,
struct file_lock *);
int gdlm_punlock(lm_lockspace_t *, struct lm_lockname *, struct file *,
struct file_lock *);
#endif
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